Correction method of measurement volume effects on time-averaged statistics for laser Doppler velocimetry

レーザードップラー流速計における時間平均統計量に対する計測体積の影響の補正方法

和田 裕貴   ; 古市 紀之*; 辻 義之*

Wada, Yuki; Furuichi, Noriyuki*; Tsuji, Yoshiyuki*

A new correction method of LDV (Laser Doppler Velocimetry) measurement volume effects on the time-averaged velocity statistics is proposed by considering the PDF (Probability Density Function) of streamwise fluctuating velocity and the streamwise cross-sectional area of the measurement volume. It is fundamentally different from the previous method using a laser intensity profile of LDV. We propose a simple equation to correct the measurement volume effects. Using this equation and calculating precisely both the measurement locations and the measurement volume, the correction of measurement volume effects on the time averaged statistics can be performed based on the LDV measurement data. From a comparison with correction method proposed by Durst et al. (1995), the present correction method provides almost same result with Durst method, and then the validity and applicability to higher Reynolds number or lower spatial conditions of two correction methods are confirmed.